555 (2016 population: 889) is a rural municipality (RM) in the Canadian province of Saskatchewan within Census Division No.

The eastern boundary of the RM of Big River borders Prince Albert National Park.

In the 2021 Census of Population conducted by Statistics Canada, the RM of Big River No.

555 is governed by an elected municipal council and an appointed administrator that meets on the second Monday of every month.

[3] The Reeve of the RM is Clint Panter while its Administrator is Michael Yuzik.